Stretching - exercise stretching vs. spasticity stretching

Your doctor will need to correlate these to stretching your spastic muscles. You do expect your doctor to actually know something, don't you?
Does pre-exercise static stretching inhibit maximal muscular performance? A meta-analytical review.
Acute effect of passive static stretching on lower-body strength in moderately trained men.
And the NYTimes blogger discussing it here:
http://well.blogs.nytimes.com/2013/04/03/reasons-not-to-stretch/
From 2008 so your doctor will know about this:
The effects of stretching in spasticity: a systematic review.

CONCLUSIONS:

There is a wide diversity in studies investigating the effects of stretching on spasticity, and the available evidence on its clinical benefit is overall inconclusive. We recognize the need for consensus on a paradigm for stretching and for good-quality studies. Future research should address this issue and should investigate the clinical importance of the short- and long-term effects.